LIVIVO - Search results -

Search results

Result 1 - 10 of total 24

Search options

Article: Multi-functional voltage and current based enhancement of power quality in grid-connected microgrids considering harmonics.

Akbari, Ehsan / Zare Ghaleh Seyyedi, Abbas

2024 Volume 10, Issue 4, Page(s) e26008

Abstract: The introduction of a renewable energy source (RES) based multi-functional grid-tied inverter (MFGTI) stands as a favorable remedy for addressing power quality concerns within distributed generation (DG) systems and microgrids. Nonetheless, the ... ...

Abstract	The introduction of a renewable energy source (RES) based multi-functional grid-tied inverter (MFGTI) stands as a favorable remedy for addressing power quality concerns within distributed generation (DG) systems and microgrids. Nonetheless, the effectiveness of a traditional MFGTI will be restricted in addressing power quality issues based on voltage. The presented research proposes a novel structure for MFGTI to enhance power quality concerns associated with voltage, current, and harmonic distortions resulting from both grid and loads. Based on this strategy, the introduced MFGTI can be linked with the grid by bidirectional switches either in a parallel or series. This feature provides various operational conditions in response to diverse disruptions in the grid. To effectively adjust the voltage, current and voltage reduction are determined through mathematical analysis, considering both the grid conditions and the load requirements. Furthermore, this strategy offers different compensation strategies, control schemes, and transition modes in the MFGTI. The major disturbances such as unbalanced and balanced voltage swell/sag, harmonics, and interruption are compensated. The shunt compensation controller is based on a second order sequence filter (SOSF) to provide the load current active component. A damping PI regulator based series compensation controller is presented for the voltage swell/sag reduction. Moreover, a new three level hierarchical control is proposed in which a droop control for compensating the interruption and a decouple dual synchronous reference frame (DDSRF) for compensating the unbalanced voltage sag/swell are utilized. The simulations in the MATLAB/SIMULINK show that using the proposed compensation strategies, the proposed MFGTI can compensate effectively the different disturbances through changing the transition states by the proposed algorithm based bidirectional switches.
Language	English
Publishing date	2024-02-16
Publishing country	England
Document type	Journal Article
ZDB-ID	2835763-2
ISSN	2405-8440
ISSN	2405-8440
DOI	10.1016/j.heliyon.2024.e26008
Database	MEDical Literature Analysis and Retrieval System OnLINE

Order via subito

This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

Article: Physico-chemical and sensory analysis of walnut coated with rose extract and probiotic: a layer-by-layer approach

Akbari, Ehsan / Parastouei, Karim / Abbaszadeh, Sepideh

Journal of food measurement & characterization. 2022 Apr., v. 16, no. 2

2022

Abstract: In the present research, layer-by-layer (LBL) coating method was adopted to improve the shelf life and nutritional properties of walnuts. To increase the shelf life of walnut, rose extract was used, which according to the results of HPLC, Quercetin and ... ...

Abstract	In the present research, layer-by-layer (LBL) coating method was adopted to improve the shelf life and nutritional properties of walnuts. To increase the shelf life of walnut, rose extract was used, which according to the results of HPLC, Quercetin and Gallic acid were the highest phenolic composition in the methanolic extract of rose. First, 0.5 and 1% Carrageenan and 2, 4 and 6% rose extract were used to coat walnuts. The results showed that increasing the concentration of Carrageenan-rose, prolonged the shelf life of walnut so that the amount of coated walnut peroxide values (Carrageenan 1% and rose 6%) and uncoated walnut after 120 days of storage were 1.95 ± 0.27 meq O₂/kg and 3.28 ± 0.37 meq O₂/kg, respectively. The amount of thiobarbituric acid in the uncoated samples (0.061 ± 0.006) was significantly higher than the coated samples (0.054 ± 0.004) at the end of the storage period. FFAs were significantly increased in uncoated samples (0.76 ± 0.02) compared to uncoated samples (0.4 ± 0.25). Moisture reduction occurred more severely in uncoated samples. In the next step, Carrageenan (1%), rose extract (6%) were used as the first layer to create LBL coating, and chitosan (1%) and Bacillus coagulans probiotic were used as the second layer. At the end of the storage period (49 days), bacteria’s population was 8.041 ± 0.012 (Log Cfu/g), that confirms the probiotic potential of walnuts with LBL coating.
Keywords	Bacillus coagulans ; carrageenan ; chitosan ; gallic acid ; measurement ; probiotics ; quercetin ; sensory evaluation ; shelf life ; storage time ; thiobarbituric acid ; walnuts
Language	English
Dates of publication	2022-04
Size	p. 1472-1482.
Publishing place	Springer US
Document type	Article
ZDB-ID	2754612-3
ISSN	2193-4134 ; 2193-4126
ISSN (online)	2193-4134
ISSN	2193-4126
DOI	10.1007/s11694-021-01251-8
Database	NAL-Catalogue (AGRICOLA)

Full text online

Accessible to users with ZB MED library card

Order via subito

Details ▾
- Full text online
- Order with fees

Article: SqueezeNet for the forecasting of the energy demand using a combined version of the sewing training-based optimization algorithm.

Ghadimi, Noradin / Yasoubi, Elnazossadat / Akbari, Ehsan / Sabzalian, Mohammad Hosein / Alkhazaleh, Hamzah Ali / Ghadamyari, Mojtaba

Heliyon

2023 Volume 9, Issue 6, Page(s) e16827

Abstract: With the introduction of various loads and dispersed production units to the system in recent years, the significance of precise forecasting for short, long, and medium loads have already been recognized. It is important to analyze the power system's ... ...

Abstract	With the introduction of various loads and dispersed production units to the system in recent years, the significance of precise forecasting for short, long, and medium loads have already been recognized. It is important to analyze the power system's performance in real-time and the appropriate response to changes in the electric load to make the best use of energy systems. Electric load forecasting for a long period in the time domain enables energy producers to increase grid stability, reduce equipment failures and production unit outages, and guarantee the dependability of electricity output. In this study, SqueezeNet is first used to obtain the required power demand forecast at the user end. The structure of the SqueezeNet is then enhanced using a customized version of the Sewing Training-Based Optimizer. A comparison between the results of the suggested method and those of some other published techniques is then implemented after the method has been applied to a typical case study with three different types of demands-short, long, and medium-term. A time window has been set up to collect the objective and input data from the customer at intervals of 20 min, allowing for highly effective neural network training. The results showed that the proposed method with 0.48, 0.49, and 0.53 MSE for Forecasting the short-term, medium-term, and long-term electricity provided the best results with the highest accuracy. The outcomes show that employing the suggested technique is a viable option for energy consumption forecasting.
Language	English
Publishing date	2023-06-03
Publishing country	England
Document type	Journal Article
ZDB-ID	2835763-2
ISSN	2405-8440
ISSN	2405-8440
DOI	10.1016/j.heliyon.2023.e16827
Database	MEDical Literature Analysis and Retrieval System OnLINE

Order via subito

Article ; Online: Engineering Nano/Microscale Chiral Self-Assembly in 3D Printed Constructs.

Esmaeili, Mohsen / Akbari, Ehsan / George, Kyle / Rezvan, Gelareh / Taheri-Qazvini, Nader / Sadati, Monirosadat

Nano-micro letters

2023 Volume 16, Issue 1, Page(s) 54

Abstract: Helical hierarchy found in biomolecules like cellulose, chitin, and collagen underpins the remarkable mechanical strength and vibrant colors observed in living organisms. This study advances the integration of helical/chiral assembly and 3D printing ... ...

Abstract	Helical hierarchy found in biomolecules like cellulose, chitin, and collagen underpins the remarkable mechanical strength and vibrant colors observed in living organisms. This study advances the integration of helical/chiral assembly and 3D printing technology, providing precise spatial control over chiral nano/microstructures of rod-shaped colloidal nanoparticles in intricate geometries. We designed reactive chiral inks based on cellulose nanocrystal (CNC) suspensions and acrylamide monomers, enabling the chiral assembly at nano/microscale, beyond the resolution seen in printed materials. We employed a range of complementary techniques including Orthogonal Superposition rheometry and in situ rheo-optic measurements under steady shear rate conditions. These techniques help us to understand the nature of the nonlinear flow behavior of the chiral inks, and directly probe the flow-induced microstructural dynamics and phase transitions at constant shear rates, as well as their post-flow relaxation. Furthermore, we analyzed the photo-curing process to identify key parameters affecting gelation kinetics and structural integrity of the printed object within the supporting bath. These insights into the interplay between the chiral inks self-assembly dynamics, 3D printing flow kinematics and photo-polymerization kinetics provide a roadmap to direct the out-of-equilibrium arrangement of CNC particles in the 3D printed filaments, ranging from uniform nematic to 3D concentric chiral structures with controlled pitch length, as well as random orientation of chiral domains. Our biomimetic approach can pave the way for the creation of materials with superior mechanical properties or programable photonic responses that arise from 3D nano/microstructure and can be translated into larger scale 3D printed designs.
Language	English
Publishing date	2023-12-18
Publishing country	Germany
Document type	Journal Article
ZDB-ID	2642093-4
ISSN	2150-5551 ; 2150-5551
ISSN (online)	2150-5551
ISSN	2150-5551
DOI	10.1007/s40820-023-01286-0
Database	MEDical Literature Analysis and Retrieval System OnLINE

Order via subito

Article ; Online: Low cost and massively parallel force spectroscopy with fluid loading on a chip.

Akbari, Ehsan / Shahhosseini, Melika / Robbins, Ariel / Poirier, Michael G / Song, Jonathan W / Castro, Carlos E

Nature communications

2022 Volume 13, Issue 1, Page(s) 6800

Abstract: Current approaches for single molecule force spectroscopy are typically constrained by low throughput and high instrumentation cost. Herein, a low-cost, high throughput technique is demonstrated using microfluidics for multiplexed mechanical manipulation ...

Abstract	Current approaches for single molecule force spectroscopy are typically constrained by low throughput and high instrumentation cost. Herein, a low-cost, high throughput technique is demonstrated using microfluidics for multiplexed mechanical manipulation of up to ~4000 individual molecules via molecular fluid loading on-a-chip (FLO-Chip). The FLO-Chip consists of serially connected microchannels with varying width, allowing for simultaneous testing at multiple loading rates. Molecular force measurements are demonstrated by dissociating Biotin-Streptavidin and Digoxigenin-AntiDigoxigenin interactions along with unzipping of double stranded DNA of varying sequence under different dynamic loading rates and solution conditions. Rupture force results under varying loading rates and solution conditions are in good agreement with prior studies, verifying a versatile approach for single molecule biophysics and molecular mechanobiology. FLO-Chip enables straightforward, rapid, low-cost, and portable mechanical testing of single molecules that can be implemented on a wide range of microscopes to broaden access and may enable new applications of molecular force spectroscopy.
MeSH term(s)	Lab-On-A-Chip Devices ; Streptavidin/chemistry ; Biotin/chemistry ; Spectrum Analysis/methods ; Mechanical Phenomena ; Microscopy, Atomic Force/methods
Chemical Substances	Streptavidin (9013-20-1) ; Biotin (6SO6U10H04)
Language	English
Publishing date	2022-11-10
Publishing country	England
Document type	Journal Article ; Research Support, N.I.H., Extramural
ZDB-ID	2553671-0
ISSN	2041-1723 ; 2041-1723
ISSN (online)	2041-1723
ISSN	2041-1723
DOI	10.1038/s41467-022-34212-w
Database	MEDical Literature Analysis and Retrieval System OnLINE

Order via subito

Article: Multiscale genome organization symposium - annual biophysical society meeting 2023.

Akbari, Ehsan / Park, Eui-Jin / Singh, Ajit K / Vinayak, Vinayak / Virk, Ranya K A / Wereszczynksi, Jeff / Musselman, Catherine A

Biophysical reviews

2023 Volume 15, Issue 3, Page(s) 313–315

Language	English
Publishing date	2023-05-31
Publishing country	Germany
Document type	Journal Article
ZDB-ID	2486483-3
ISSN	1867-2469 ; 1867-2450
ISSN (online)	1867-2469
ISSN	1867-2450
DOI	10.1007/s12551-023-01063-8
Database	MEDical Literature Analysis and Retrieval System OnLINE

Full text online

Accessible to users with ZB MED library card

Order via subito

Details ▾
- Full text online
- Order with fees

Article: Physico-chemical and antioxidant properties of barberry juice powder and its effervescent tablets

Naji-Tabasi, Sara / Emadzadeh, Bahareh / Shahidi-Noghabi, Mostafa / Abbaspour, Mohammadreza / Akbari, Ehsan

Chemical and biological technologies in agriculture. 2021 Dec., v. 8, no. 1

2021

Abstract: BACKGROUND: Barberry fruit is a good source of natural antioxidants and various functional compounds. Different concentrations of maltodextrin (10, 13, and 16% w/w) were used to produce spray-dried barberry juice powder and the powders (50, 60, and 70%) ... ...

Abstract	BACKGROUND: Barberry fruit is a good source of natural antioxidants and various functional compounds. Different concentrations of maltodextrin (10, 13, and 16% w/w) were used to produce spray-dried barberry juice powder and the powders (50, 60, and 70%) were applied to create effervescent tablets. RESULTS: The results showed that by increasing the amount of maltodextrin concentration, moisture, and water activity decreased (p < 0.05), but antioxidant activity increased. The barberry powder prepared with 13% (w/w) maltodextrin showed appropriate flowability, color, high antioxidant activity, and phenol content. The presence of high amounts of barberry powder in the tablet increased the disintegration time (1.02–4.03 min). CONCLUSIONS: The tablet containing 60% barberry powder was selected as the best sample. Based on the results, barberry tablets with good color, high antioxidant activity, and phenolic compounds can be used as a ‘ready-to-drink’ product.
Keywords	Berberis ; agriculture ; antioxidant activity ; antioxidants ; color ; fruits ; maltodextrins ; phenol ; spray drying ; water activity
Language	English
Dates of publication	2021-12
Size	p. 23.
Publishing place	Springer International Publishing
Document type	Article
ZDB-ID	2762782-2
ISSN	2196-5641
ISSN	2196-5641
DOI	10.1186/s40538-021-00220-z
Database	NAL-Catalogue (AGRICOLA)

Order via subito

Article: Catalytic Methane Combustion on the Hydrothermally Synthesized MnO₂ Nanowire Catalysts

Akbari, Ehsan / Alavi, Seyed Mehdi / Rezaei, Mehran / Larimi, Afsanehsadat

Industrial & engineering chemistry process design and development. 2021 May 14, v. 60, no. 20

2021

Abstract: The various morphologies (wire, rod, tube, and flower) of the MnOₓ nanocrystalline catalysts were prepared using the hydrothermal and solution methods, and the prepared samples were evaluated for catalytic combustion of methane. The results revealed that ...

Abstract	The various morphologies (wire, rod, tube, and flower) of the MnOₓ nanocrystalline catalysts were prepared using the hydrothermal and solution methods, and the prepared samples were evaluated for catalytic combustion of methane. The results revealed that the wire-like MnO₂ catalyst showed an excellent performance in the methane combustion reaction. The light-off temperature related to 90% of the CH₄ conversion was about 400 °C for the wire-like sample, which was higher than those obtained in other catalysts with different morphologies. The influence of the different synthesis factors including the hydrothermal temperature, pH value, aging time, and calcination temperature on the textural properties and activity of the catalysts was investigated. The obtained results confirmed that varying the preparation factors had a considerable effect on the structure and activity of the catalysts. The sample synthesized under the specific conditions (Tₕydᵣₒ. = 240 °C, pH = 3, aging time = 24 h, and Tcₐₗ. = 400 °C) displayed the highest efficiency in the methane catalytic combustion process. Furthermore, the effect of various operating parameters including the gas hourly space velocity, feed (O₂/CH₄) ratio, pretreatment condition, type of solvents, and catalytic stability in the existence of CO₂ and steam was studied on the catalytic performance. The results revealed that the catalyst stability of the optimal MnO₂ sample reduced to some extent with the concurrent concentration of CO₂ and water vapor in the reactant feed stream. In the presence of CO₂ or/and H₂O, the initial CH₄ activity at 350 °C was below 20%. However, the long-term stability showed high stability under the dry feed at 450 °C for 50 h.
Keywords	carbon dioxide ; catalysts ; catalytic activity ; combustion ; flowers ; methane ; nanocrystals ; nanowires ; pH ; process design ; steam ; temperature
Language	English
Dates of publication	2021-0514
Size	p. 7572-7587.
Publishing place	American Chemical Society
Document type	Article
Note	NAL-AP-2-clean
ZDB-ID	1484436-9
ISSN	1520-5045 ; 0888-5885
ISSN (online)	1520-5045
ISSN	0888-5885
DOI	10.1021/acs.iecr.1c00881
Database	NAL-Catalogue (AGRICOLA)

Order via subito

Article ; Online: Relevance between Helicobacter

Mohammadifard, Mahyar / Saremi, Zeinab / Rastgoo, Mahboobe / Akbari, Ehsan

Journal of medicine and life

2019 Volume 12, Issue 2, Page(s) 168–172

Abstract: There is evidence that infection ... ...

Abstract	There is evidence that infection by
MeSH term(s)	Adult ; Case-Control Studies ; Cross-Sectional Studies ; Female ; Helicobacter Infections/blood ; Helicobacter Infections/complications ; Helicobacter Infections/epidemiology ; Helicobacter pylori/physiology ; Humans ; Iran/epidemiology ; Lipids/blood ; Liver/enzymology ; Liver/pathology ; Male ; Non-alcoholic Fatty Liver Disease/blood ; Non-alcoholic Fatty Liver Disease/complications ; Non-alcoholic Fatty Liver Disease/epidemiology ; Transaminases/metabolism
Chemical Substances	Lipids ; Transaminases (EC 2.6.1.-)
Language	English
Publishing date	2019-07-16
Publishing country	Romania
Document type	Journal Article
ZDB-ID	2559353-5
ISSN	1844-3117 ; 1844-3109 ; 1844-122X
ISSN (online)	1844-3117 ; 1844-3109
ISSN	1844-122X
DOI	10.25122/jml-2019-0012
Database	MEDical Literature Analysis and Retrieval System OnLINE

Order via subito

Article ; Online: The effect of fibrinogen concentrate and fresh frozen plasma on the outcome of patients with acute traumatic coagulopathy: A quasi-experimental study.

Akbari, Ehsan / Safari, Saeed / Hatamabadi, Hamidreza

The American journal of emergency medicine

2018 Volume 36, Issue 11, Page(s) 1947–1950

Abstract: Introduction: The debate on replacing coagulation factors and its effect on the final outcome of the patients with acute traumatic coagulopathy (ATC) in need of transfusion is still ongoing. Therefore, the present study is designed with the aim of ... ...

Abstract	Introduction: The debate on replacing coagulation factors and its effect on the final outcome of the patients with acute traumatic coagulopathy (ATC) in need of transfusion is still ongoing. Therefore, the present study is designed with the aim of comparing the outcome of patients with acute traumatic coagulopathies receiving fibrinogen and fresh frozen plasma (FFP). Methods: In this quasi-experimental randomized controlled study, patients with severe blunt trauma (ISS>16) and in need of packed cells transfusion were divided into 3 groups of receiving fibrinogen, receiving FFP, and control, and their final outcome was compared. Results: 90 patients with the mean age of 33.16±16.32years were randomly allocated to one of the 3 study groups (82.2% male). The 3 groups were similar regarding baseline characteristics. Patients receiving fibrinogen needed significantly less packed cells (p=0.044) and intravenous fluid in the initial 24h of hospitalization (p=0.022). In addition, mortality rate (p=0.029), need for admission to intensive care unit (p=0.020) and duration of hospitalization (p=0.045) were also lower in the group receiving fibrinogen. The number of sepsis cases in patients receiving fibrinogen and control group was lower than those who received FFP (p=0.001). The number of multiple organ failure cases in patients receiving fibrinogen was about one fourth of the other 2 groups (p=0.106), and a fewer number of them needed mechanical ventilation (p=0.191). No case of venous thrombosis was detected in any of the 3 groups. Conclusion: Multiple trauma patients in need of transfusion who received fibrinogen along with packed cells had significantly better outcomes regarding mortality, sepsis, need for admission to the intensive care unit, need for receiving packed cells, need for receiving intravenous fluids in the initial 24h, and duration of hospitalization.
MeSH term(s)	Adolescent ; Adult ; Aged ; Aged, 80 and over ; Blood Coagulation Disorders/etiology ; Blood Coagulation Disorders/therapy ; Blood Component Transfusion/methods ; Female ; Fibrinogen/therapeutic use ; Humans ; Male ; Middle Aged ; Multiple Trauma/complications ; Plasma ; Treatment Outcome ; Wounds, Nonpenetrating/complications ; Young Adult
Chemical Substances	Fibrinogen (9001-32-5)
Language	English
Publishing date	2018-02-22
Publishing country	United States
Document type	Journal Article ; Multicenter Study ; Randomized Controlled Trial ; Research Support, Non-U.S. Gov't
ZDB-ID	605890-5
ISSN	1532-8171 ; 0735-6757
ISSN (online)	1532-8171
ISSN	0735-6757
DOI	10.1016/j.ajem.2018.02.018
Database	MEDical Literature Analysis and Retrieval System OnLINE

Full text online

Accessible to users with ZB MED library card

In stock of ZB MED Cologne/Königswinter

Zs.A 2005: Show issues

Location:
Je nach Verfügbarkeit (siehe Angabe bei Bestand)
bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
Jg. 1995 - 2021: Lesesall (1.OG)
ab Jg. 2022: Lesesaal (EG)

Order via subito

Details ▾

To top

Your last searches

More links

Kategorien

Order via subito

Full text online

More links

Kategorien

Order via subito

More links

Kategorien

Order via subito

More links

Kategorien

Order via subito

More links

Kategorien

Order via subito

Full text online

More links

Kategorien

Order via subito

More links

Kategorien

Order via subito

More links

Kategorien

Order via subito

More links

Kategorien

Order via subito

Full text online

More links

Kategorien

In stock of ZB MED Cologne/Königswinter

Order via subito